general protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000048-0x000000000000004f]
CPU: 0 PID: 3642 Comm: kworker/u5:2 Not tainted 6.1.0-rc4-syzkaller-01033-gb548b17a93fd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Workqueue: krxrpcd rxrpc_peer_keepalive_worker
RIP: 0010:udpv6_sendmsg+0xe7a/0x2c70 net/ipv6/udp.c:1433
Code: ff ff ff 48 83 c0 08 48 89 85 68 fd ff ff 48 8b 85 c0 fd ff ff 48 8d 78 4e 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 d0 1b 00 00
RSP: 0018:ffffc90004e5f7d8 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: 000000000000001c RCX: 0000000000000000
RDX: 0000000000000009 RSI: ffffffff88225844 RDI: 000000000000004e
RBP: ffffc90004e5fa78 R08: 0000000000000003 R09: 0000000000000000
R10: 000000000000214e R11: 0000000000000000 R12: ffff888077d84fc0
R13: 000000000000214e R14: ffff888077d84fd2 R15: ffffc90004e5fb00
FS:  0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa843f7f1b8 CR3: 0000000066bfc000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_udp_sendmsg net/rxrpc/output.c:27 [inline]
 do_udp_sendmsg net/rxrpc/output.c:21 [inline]
 rxrpc_send_keepalive+0x3db/0x470 net/rxrpc/output.c:703
 rxrpc_peer_keepalive_dispatch net/rxrpc/peer_event.c:327 [inline]
 rxrpc_peer_keepalive_worker+0x7cd/0xc10 net/rxrpc/peer_event.c:391
 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:udpv6_sendmsg+0xe7a/0x2c70 net/ipv6/udp.c:1433
Code: ff ff ff 48 83 c0 08 48 89 85 68 fd ff ff 48 8b 85 c0 fd ff ff 48 8d 78 4e 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 d0 1b 00 00
RSP: 0018:ffffc90004e5f7d8 EFLAGS: 00010207

RAX: dffffc0000000000 RBX: 000000000000001c RCX: 0000000000000000
RDX: 0000000000000009 RSI: ffffffff88225844 RDI: 000000000000004e
RBP: ffffc90004e5fa78 R08: 0000000000000003 R09: 0000000000000000
R10: 000000000000214e R11: 0000000000000000 R12: ffff888077d84fc0
R13: 000000000000214e R14: ffff888077d84fd2 R15: ffffc90004e5fb00
FS:  0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa843f7f1b8 CR3: 000000001c3c4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	ff 48 83             	decl   -0x7d(%rax)
   3:	c0 08 48             	rorb   $0x48,(%rax)
   6:	89 85 68 fd ff ff    	mov    %eax,-0x298(%rbp)
   c:	48 8b 85 c0 fd ff ff 	mov    -0x240(%rbp),%rax
  13:	48 8d 78 4e          	lea    0x4e(%rax),%rdi
  17:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  1e:	fc ff df
  21:	48 89 fa             	mov    %rdi,%rdx
  24:	48 c1 ea 03          	shr    $0x3,%rdx
* 28:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax <-- trapping instruction
  2c:	48 89 fa             	mov    %rdi,%rdx
  2f:	83 e2 07             	and    $0x7,%edx
  32:	38 d0                	cmp    %dl,%al
  34:	7f 08                	jg     0x3e
  36:	84 c0                	test   %al,%al
  38:	0f 85 d0 1b 00 00    	jne    0x1c0e